Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 18 of 18 for “"Consensus Mechanism"”.
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The novel Proof of Efficiency (PoEf) Consensus Mechanism: improved efficiency and cybersecurity for Blockchain-based Supply Chain Management Systems.
… data exchanges. However, current blockchain consensus mechanisms struggle to meet the efficiency and scalability requirements of modern SCM systems while remaining vulnerable to attacks. This thesis explores the optimisation of consensus mechanisms, particularly focusing on improving …
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How much does trust cost? : analysis of the consensus mechanism of distributed ledger technology and use-cases in securitization
… how blockchain has achieved decentralized consensus, a remarkable innovation by: 1) validating transactions based on cryptograph technologies and implicit incentives; 2) extending blockchain networks based on a process of randomization. The success of emerging distributed ledger technology …
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Design and development of a parallel Proof of Work for permissionless blockchain systems
… is a distributed ledger forming a decentralized consensus in a peer-to-peer network. A large number of the current cryptocurrencies use blockchain technology to maintain the network and the peers use a consensus mechanism called Proof of Work to verify and confirm the transactions. However, the …
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Healthcare Agents: Large Language Models in Health Prediction and Decision-Making
… on task complexity, implementing a hierarchical consensus mechanism that emulates clinical team dynamics. Through comprehensive evaluation on medical diagnosis and reasoning tasks, MDAgents exhibits superior performance in multimodal medical reasoning compared to single-agent approaches. Our …
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Permissioned blockchain in a supply chain problem
… through the Practical Byzantine Fault Tolerance consensus (PBFT) that guarantees the correctness of the information. Finally, using a two-sided markets model we provide a preliminary setup of a fee system that creates incentives to enter the platform: the blockchain network. Our results suggest …
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Mechanistic investigations of enzymes in phosphonate metabolism
… studies were undertaken to elucidate the mechanism of catalysis by HEPD. These studies demonstrated that an unusual iron(IV)-oxo intermediate is at the heart of the catalytic cycle of HEPD. Also reported in this dissertation are studies on an enzyme with distant homology to HEPD, …
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Analysis of Privacy-aware Data Sharing in Cyber-physical Energy Systems
… a comprehensive analysis of the existing consensus mechanisms in blockchain-enabled smart grids while pointing out the potential research gaps. We develop a practical and effective consensus mechanism for a private and permissioned blockchain-enabled Supervisory control and data …
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Reinforcement Learning assisted Adaptive difficulty of Proof of Work (PoW) in Blockchain-enabled Federated Learning
… in blockchain technology's Proof of Work (PoW) consensus mechanism. Existing consensus algorithms, such as PoW, PoS, and PoB, have succeeded in public blockchains but face challenges due to heterogeneous miners. This thesis highlights the significance of considering miners' computing power and …
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Blockchain-Based Distributed Network Architecture for Internet of Things
… due to the lack of strong self-protection mechanisms and the imperfect network architectures, many IoT devices are vulnerable to malicious cyber-attacks, which will further threaten the availability and security of IoT applications. Therefore, securing the network infrastructure while …
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Achieving Construction Material Traceability by Leveraging Blockchain Technology
… and unique material tracking. Also, the consensus mechanism of blockchain will allow all participants to be involved in each transaction, which could increase visibility, communication, quality of materials and reduce fraud, and disputes. A platform has been built according to obtained …
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Privacy-preserving decentralised collaborative applications
… from new collaborators, and without relying on a consensus mechanism. Lastly, we evaluate the overhead of the snapshot protocol by replaying editing histories from 270 Wikipedia articles, and demonstrate how its correctness and security properties are achieved. Assuming the number of collaborators …
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Blockchain Framework for Secured On-Demand Patient Health Records Sharing
… from Proof of Work (PoW) to Proof of Stake (PoS) consensus mechanism and it has the potential to further improve the performance of the proposed framework. Extensive evaluation of the developed system demonstrated the impact of the network workload on performance metrics, confirming low system …
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Resource optimization algorithms for an automated coordinated CubeSat constellation
… the constellation through a distributed, "weak" consensus mechanism. The performance of the algorithms is tested with a 24 hour simulation of an eighteen satellite constellation over multiple orbital geometries and inter-satellite communication contexts. The orbital geometries include a modified …
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The constitutional approach to the fiscal process: an inquiry into some logical foundations
… where equiprobability is attained. Two basic mechanisms which potentially operate when the vaccatio legis increases are identified. One, the Consensus Effect, tends to make separate individual most preferred choices with respect to tax structures more similar to each other. The other, the …
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Trustworthy Federated Learning Systems: From Secure Distributed Training to Reliable Fine-tuning
… with a Zero-Knowledge Proof of Training (ZKPoT) consensus mechanism that enables verifiable and privacy-preserving coordination among distributed participants. In this framework, clients generate zero-knowledge proofs to demonstrate that local model updates are produced through legitimate …
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Trustworthy and Efficient Blockchain-based E-commerce Model
… assets. To enhance customer engagement through consensus, we utilize the XGBoost algorithm to identify loyal nodes from the platform entities pool. Alongside appointed nodes, these loyal nodes actively participate in the consensus process. The consensus algorithm guarantees that all involved …
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Blockchain-enabled Secure and Trusted Personalized Health Record
… process by both the patient and built-in HF consensus mechanism. We measured system scalability and showed millisecond-range performance of LPHR permission changes. In this dissertation, we report the BEST-LPHR solution to electronically sharing and managing patients' electronic health …
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Assessing Blockchain’s Potential to Ensure Data Integrity and Security for AI and Machine Learning Applications
… smart contracts and the Proof of Work (PoW) consensus method. Using SHA256 to produce a cryptographic signature for each data block improves the aforementioned procedure. The public Ethereum blockchain serves as a secure repository for these signatures, whereas a cloud-based infrastructure …